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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96089f1e22c9daf91230a36d20257dd236b575fe75bf0be85fbc793683f6b93' 
  AND token = 'i7tL6Q/lCn1/F4aY12vKsBmlpm8L8cvEGjic5gm0q94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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