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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641ea141a276cecce6ea45d1344a5c3f23e35f7da6f6baad56bad2eb4bec4eef' 
  AND token = 'Vhdf0V5ekObMQKY9eszKGfknpEugssBbcNWF3LoN/oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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