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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a342456510dfcb7605d8bb76d76cd15ad8698946efaee7a54bb9116bb6a9e80a' 
  AND token = 'PDeB8X1cZAk/5yM4E4STEVjEqGvXb02nlkfU4aibgGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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