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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007f90677d8ec5184e6dbdebfb660f31e78df7efab6aeff12110f9c5135dde0f' 
  AND token = 'Xh9Nt06TW6uX0JVkZtRr206L82pUypKj/MFpejoN/Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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