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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c7891f62d19b954aec5b1a70ef65ba207ce6000a12ac73d160e4df30f0842e' 
  AND token = 'mHrMOB+27hW/6HYfUD8/XLBlL+97eIM30bZZKCGLZto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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