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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92befb7d64857508aa773a20812e85ac89a112f3a712d853cb4e64139bf55ac4' 
  AND token = 'oMxaIq1Z74SfjkuMF338LhVY3Nbs231s5t+NMU81hP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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