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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f6ee6b3d51cb5bc18b3e489e068c41d6205fbcb1139739d10ffe5bf7e52b99' 
  AND token = 'SrvqDrz3koZr3S+sKunI21pkNUsJnjWHKaIZNBFQFBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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