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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a52c075304e96e83925a0e2db10d971023100e4288bbbc8c806fc62dd0d70ee' 
  AND token = 'rjTYJh9juhFqlECWDfzRk7yIJvMG4/g12u9gJIHtDUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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