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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7110c4b5da811f0377c50677f1c0d99e25ded7f7650e2edeffb4bae57fd63f' 
  AND token = 'ft5mWEN20cj4YjRnm3drQ9ZZpinNohpu+IC3lKdfN44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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