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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e5372276466724ca0f87335e7f575e8e7b1c83dc7a28b20e0ff0ffbb3e9d4c' 
  AND token = 'pgRglRIrdQ5KsZh8w7aBnqn643keM5/qMS+P/tTJgRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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