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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ef77d8f89a7e527a5ec5b6895926211148bea7b2d511f151f96d3cf9756ef7' 
  AND token = 'D7BhTDWrWuFBWrFgb+lcrFNXujSc3niXSIhBXf8DTuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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