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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36b87240cddfea430770cdb666dd32dbffc0927e78f1b002ddd2957b0a7a091' 
  AND token = 'aShvLN5XdVAfmpGTtl9yRx+LGBozSpFT09r8CcrlOKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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