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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7390428719cbebf6b5df895e19cce6bedd5af794d41997eb0a1c88f005c3eadb' 
  AND token = '09n34G34oLrsEl7krnSB+cCQTdeCxVQ1Oc972aW5WpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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