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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e0899b96a68f0c5e155ece5d38abcfb016a8064893a6841333086161d29d20' 
  AND token = 'SoLxrobhmgiwugbtRogcmWyqkGC0Rwob+ZKwOy+30io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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