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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921cdf4ab363a827dc47da6a83f3cd6e5184dabcd0d0fe2b9588836c4045b676' 
  AND token = 'tAatNv3uo1TDH3lwLrQnnb8sQDrllL5x/lyrdPKaroY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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