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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7001d302aed93514a4919060e359e1d2dacf49a5b05683e477bc91367ad70442' 
  AND token = 'N62eVAVdlGbbfX5Y63EmJeL65y5pNoK2l3ss0nEXLB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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