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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaedf886463b6f848a107dc9b26869b402a22b6a51086ecafc2efe6015cd8f33' 
  AND token = 'RwhswddlVHOcaztETyohYx4KkwJL4wk2QDfWYQYjW1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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