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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba486d4ee6b78fc42cefd6893fd672aba9dd5320d01200481c90eee339c4822' 
  AND token = 'GlqRgtg0E1RAlC4ok79dNT7WauIytnIJ78mp05dGs6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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