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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fccde327105261f8363f70697a8d34f23841ac443bdec44f8c1704d913acbc6' 
  AND token = 'zL39TbvnOHS1ubMq2ZJ6Q1lvJ5yMswYqriclLI0uvoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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