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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6c974940f53f5e5fcf97c05de896fa6422b0590cbf0737b7c980509e4d743c' 
  AND token = 'je2NHvTDRs7VBfzLWXH/iqX0sCtxN0DPqlZZGK5vRbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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