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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a851b1b64c00ea45d1194d9d87decea0b7c3fdde1306805b976249242534d6' 
  AND token = 'ps4/1MCnJrnyniShLgm1/FnMGbqSZBRsbiqskb2QQVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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