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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e26639309bef6d33a5b05dc6adb5b24145bd2f677d88eccd0e83f4aba2a69f' 
  AND token = '/3CIBUnyYXyHh63uI21iwCDEsNtd4g/rzYLs7QD4K4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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