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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d2ec06051d81fe2c7291839c898841cb8406d7f87821f8f8f4af2f3413edd7' 
  AND token = 'FudUG4FJkfoBlfAewnrnfC5YX9rytCXD1bzeQz076cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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