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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983687f4b40ed82350c84addc771accb0fbbfd464945131a2985aa5c296c38e0' 
  AND token = 'JKbdBbbt+iS+Y9ZScBJ2heo60dIr3t1XHjlCScccPLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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