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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150f5d28ccf6d5936ba72568b30100841f45555c06ca50d4aedf4f4a44394c1e' 
  AND token = '17kT8MtKev9tiqGik0W02u65BUooniFmd9Ur2swvfSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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