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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c798209e2538983350947ee9122f65e64ed6f6864c9c3be851df43ce748079b6' 
  AND token = '7dAmk2itdcIzK0eNwyx815x++5toNWbZlxSl+6JWkYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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