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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98753c3b3819d2091719fa5a46d6170a9c1c614bf38b3a4f8c35fa4506b47aa4' 
  AND token = 'v8snopML44473dFi7hI1eN8g9+AaTFZLuuQUI6/P7lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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