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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30eda30751c00f3208f994c14030a75d312300515809719e5d9eb549d53eb486' 
  AND token = 'ucpMTTNSf9rmOZEdWmf9BR9cy0CQ6kXuwngj+NHo73E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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