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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710ca71be05b042d05f945818b830321b38e6d3c503b68dffa09acb25008320a' 
  AND token = 'dZcSS4eUmOmUqh3MHz1+yuYuQelv2NPPpHbMEV0Y8FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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