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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91438a6c9bef25404bca18ba76e48ec1161d5423ccad39ca3fc7b43172faca7a' 
  AND token = '5S0vu3147ZczY5n3lkIVjxf97V09BHM6GA1o/6hUW4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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