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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bb42ccdbec186731f10e8d80540a7fd144ad3cf71400bcaa816a3547228f2a' 
  AND token = 'aCzCDLySv3Ecnazn/z3utMOJy3YbgW4ie6/USdtXtI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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