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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e51e5b95a9d81bb4d51bf2e0aca364410b7be535fafb80cb64daef20628f97' 
  AND token = 'ot6czyPEi9QBOywAbtyqg+hQp20IM3zDpqA5QImpqwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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