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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11908675837cf9aae77de54680ff94861b13ad37b4573e86e2f3fbabfc538bd4' 
  AND token = 'R0jB2rn+uz9PDP5XiRsdlHHg7Kve2scmS0kr5ern6jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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