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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d11690d377750772bbd7e8d63cb4e1e9a8083b3a2faf6abcf6a4577ab5a3ed1' 
  AND token = '/YbgLbzLUBr5U88lAw9Ny+51cj703MijMj9JSCYre4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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