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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3103db617748b6f2ff1ba9dd0f9dec4dc139b3b6649842fad5e4b9e607e43320' 
  AND token = 'MajU0GbKZpk2PUudmF2bsyLQ/u7CSbKHUByRKi8lRI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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