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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feec5901a1837b4012b111d40af24af9198c227d0a2e9259678794c4ac1415a3' 
  AND token = 'erjPRm3KOJZkmMz1knvNO8HQc+Shb0iwo1C0dRCKRJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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