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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2cc15ada35cf97ac2ba5910998c84dc6974757b8d4c8e2988dce5c564ded491' 
  AND token = 'iDdiojuBC7pUrSg5BpvUSsDjDh3Cx7BQfCGnEYj1/eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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