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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1d307b6a556109fe7010d18035e187b8fa47dcc7e7892db420afeea26b7c5c' 
  AND token = '2xODshIv97Tnik7LDnR2dj2n6yMdfQt2P2EIq8kw9xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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