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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675e231337b2c6d6e8c827f7b111264d03a924cfd59bc8fbe43657996ecc3d89' 
  AND token = 'WA/MO1/eDhke8/0TVmyWcI9YSr43qEBT+BuIgig2vxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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