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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b5187e88aa1471d4512ab556263eb2b2731a8f5e87ef3ea6616ae00e915c58e' 
  AND token = 'Ksc+CGBQ5p1gklrJftDD4K1LU5pV26qZGkgpuiBlaDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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