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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46b084e2de68c509ce6f7ce19e9e119f31f5c97bc341a711f2be4107aa6f4e0' 
  AND token = 'bXm8zHjGiP55rvmwWZudk4zTjMFHolO/xURp8ev6ss0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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