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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ebb7ff9641cd239bfd7aa3fc91007089789d1d47d9cc06befc1efb54159129' 
  AND token = '9sAPV5NABGrB5whDZ4Ydu4f2wT22Vb0McI7eiqkuH0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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