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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6722301b5a1ff032419084c7b1bafa2c26bad084db7af81b049dd82ac5a11ed' 
  AND token = 'Raqm+kWbiSNPLDPyd/LL1aM/xcdshcNOyg8p+hfcFgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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