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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5032e1b51a8980a62b64f34686760f64c9d3ae638fb12d593d7cea0c2850a60d' 
  AND token = '4JM7p3OL1IST01emWkDY70I15Z1r6LbeDTOtDpmDwV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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