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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3f8123d507a60dd33e4a96e34bbe6cd851abac51b64efe4a15c6f2c50c6883' 
  AND token = 'GSmKeEdwiUg9bz53k02ZtgjqLfmMdmgPNrLfkinYF3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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