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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6a24cb0ba04bdde75c064ce84789ce991ae4764c6c822fc385c210cd0ef572' 
  AND token = 'oJ/R2r4Umj54XGJ3dLM7Op0Pr2+0u5oW/a2aFsDxFB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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