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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b18c932161844fd6812e6d72cad691e29f06faa3d45ed6ec0fe5eae9040f13' 
  AND token = '7gG/KU+ylfsr1m2+wbOrjyMq8pMXjtDI2G94c2iEne0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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