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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790401b685c41b415e2cfe8fb80a48bccecef758050525c2e37fcfe8766aa91b' 
  AND token = 'ieeVTA04eLIFLWq5Holc0GWOa0wnGrXN4rMX+/qFXbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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