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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aeca37ea079cbcaf2f94cc868ea2806e0971c3dee108868e90cbcb7f10b4c75' 
  AND token = 'FiAIYLm4Q5gElevrhmrKNH4srIMVj5a2GDew2ZoI8f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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