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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c10988507ef7948b40ad74fd54939b447a1cc0009e642c8587df0624e9d41c' 
  AND token = 'ETDpx+yZOAHVZDSuYfFvInZGNrjujpc/I+COrGPYIno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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