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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5c07ce2723840225b0856d5933f890e77f6e3398c6a5efac985f265334c9e2' 
  AND token = 'qz8s+Hnw6QYCm9vaUx0JDzQgOEO0y/ZIUe5mRGVEeQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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