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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9230656f8f60ffc239aff0a51d8bf613472964065c2af73fc1a05c7e8c6d4bbc' 
  AND token = 'v5kmp4r2OjSZXH769H53PmL1/VJ7/+eKK4st9wS3+QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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