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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbf43d7f4a78a2d50f52364b664ab0bc1d49e0c471dc2c824ec03e346e63371' 
  AND token = 'qROTLFOwqBB+MTXAYy6iRCQzvPu68Pf0/j6sAYPMM1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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