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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f26a0c5710997364c1b6c0dbf30a14467bab44aea5372fb4226e2a1bb8e93eb' 
  AND token = 'RSBsRmh0DkKHGgY+uDJOsOR8OJqFfKP3k3V55r32710=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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