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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4505a8b468b2bb9f9e9208e3e0caa73880bfd9539865bae958e8484642b8f23' 
  AND token = 'o1SAQNyu9hChwiXm6qQG+nXdqoo+i7ldEOIesnb8msg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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