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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef9cd0ba1dc7893cb76d0e858b1991d1d37ac8e911571862c237361f0ac54d5' 
  AND token = '6UP9VJ/vmme6FOmQNqQ9tojufiNHic4UytBVYAdXp7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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