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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35e570f10e5151f29b0f85f0b62fb2bdde19bdd84af94e2dda84974589eca00' 
  AND token = 'JSPr0PfgwG0yocekchcjpsXszH4OFiZN1HboJfZ7yE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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