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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27685f35f5a0dcdfeec7de651491fcf2058e880513a28b06c962a88bced46e13' 
  AND token = 'vcyi5RmvRybNUYy0/6y8rt6ssF6IPpuuDr4Vg9UUa78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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