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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d72477b276d708ebe20e57c0c12a60ac10e2e804e26d081b89a9f934e55242e' 
  AND token = '2Cv7bacIrlHfPLbRR4zXgZDHQgFOU7MSn6xt2kYmO+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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