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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b07406b793204cfaf8d464be916c6586db8dc25b614a6ab29235cea8d5f33a' 
  AND token = 'olrqzuGwm66gUy9azazfBFb5y/tfcbRQIER8GpcTyW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}