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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2931f140c30e030989296bf6859bef9f3003349e63f201d9e1f3f2cdfe1cfac2' 
  AND token = 'W3t4L+JQMALo4Gs/BpBVNivpDperr5Zb7iUoxVqIRmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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